Loom dobby



Aug. 4, 1931. AziA. oRboN 1, 17,139

LOOM DOBBY Filed July 24, 1950 2 Sheets-Sheet l Aug. 4, 1931. A. A. GORDON 1,817,139

' LOOM DOBBY Filed July 24, 1930 2 Sheets-Sheet 2 5 7 finer/Pr /7. 00/7270 F a i 6: v v I [M igrafiwqx q Patented Aug. 4, 1931 UNITED STATES "PATENT OFFICE ALBERT A. GORDON, F WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON &. KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS Application. filed July 24,

cember 20, 1927.

In my prior patent, I have shown a double cylinder dobby adapted for double index operation and having a gear-driven mechanism for positively rocking the lever-supporting frame of the (lobby in one direction. Movement in the opposite direction was under the control of a spring.

This yielding return action was found unsatisfactory, as'the mechanism to be controlled was of substantial weight and the timing of the parts was found unreliable,

when a spring was used for the return movement.

Furthermore, thespecial high links used as indicators interfered with the folding of the portions of the chain in storage.

It is the object of my present invention to provide driving mechanism so designed and constructed that the lever frame in a double cylinder dobbywill be moved positively in both directions,'leaving no uncertainty in the operation thereof.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the drawings, in which Fig. 1 is a side elevation of my improved dobby;

Fig. 2 is a partial sectional plan view, taken along the line 22 in Fig. 1;

Fig. 3=is a sectional side elevation, taken along the line 33 in Fig. 2;

Fig. 4 is a partial sectional side elevation, similar to Fig. 3 but showing the parts in a different position;

Fig. 5 is a diagrammatic view, indicating the driving mechanism for certain parts;

Fig. 6 is a plan view, looking in the direction of the arrow 6 in Fig. 1;

Fig. 7 is a sectional front elevation of certain parts, taken along the line 7-" in Fig. 6;

Fig. 8 is a detail sectional elevation, taken along the line 8-8 in Fig. 7;

LOOM DOBBY r 1930. Serial No. 470.497.

link 12 (Fig. 5) to a crank-pin 13 by which ithey are oscillated. The rocking levers 11 reciprocate the usual upper and lower knife bars 14 and 15.

Dobby levers 16 (Fig. are pivotally mounted on the usual harness jacks 17 and support upper and lower dobby hooks l8 and 19. The upper hooks are operated by alternate dobby levers 20through lifter rods 21 and the lower books 19 are operated by the upturned ends 22 of the remaining dobby levers 20.

The do'bby levers 20 rest upon the adjacent ends of two sets of cylinder levers 2d and 25, pivoted on cross rods 26 and 27 in a rocking frame 28, which in turn is secured on a cross shaft 29.

Front and back dobby cylinders 30 and 31 are rotatably mounted in the dobby frame 10 and are provided with collars 300 and 310 fixed to the cylinder shafts adjacent loose gear wheels 32 and 33 to which they may be clutched one at a time and thus cause the corresponding cylinder to rotate,

' the cylinders rotating in opposite directions.

The gear 33 is connected by a worm wheel 35 and intermittent worm 36 to an upright shaft 37 which is connected by bevel gears 38 (Fig. 5) to the shaft 39 which carries the crank pin 13.

hen the rocking frame 28 is in the posi tion shown in Fig. 3, the front set of cylinder levers 24 is in position for operation by the pattern chain on the cylinder 30, but when the frame 28 is rocked to the position shown in Fig. 4., the cylinder levers 25 are in position for engagement and control by the pattern chainon the rear cylinder 31.

For further details as to the construction and operation of the double cylinder dobby,

by an intermittent worm 44 on the upper end of the shaft 37 previously described. A sliding clutch member 410 is keyed to the hub of the cylinder 41 and maybe moved to engage the chain elements. v

The pattern chain 40 positions a pair of rocking levers 45 and 46, pivoted at 47 and connected by .adjustablelinks 50 and 51 (Fig. 1) to the oppositely disposed arms of a rocking lever 52 securedv to the shaft 29 which supports the rocking frame 28.

When a ball or riser 55 on the, pattern chain 40 comes under the'rocking lever 45, the link 50 is depressed, moving the frame 28 to the position shown in Fig. 3 with the front set of cylinder levers 24in operative position. r

When a riser 55 comes under the second rocking lever. 46, the frame 28 will be rocked in the opposite direction to the position shown in "Fig. 4, with the cylinder levers 25 in operative position. 1

Positive operation of the rocking frame 28 is thus effected in both directions andno spring action isused, as a spring has been found to introduce uncertain timing and to otherwise rend'erthe mechanism unreliable. It is desirable that each pattern cylinder remain at rest when out of operative position and for this purpose a three-armed lever (Fig. 2) is mounted on a fixed pivot 61 and is provided with a slotted-arm 62 having an opening through which extends a stud 63 on the hub of the rocking lever 52. The other two arms 60 and 60 of the lever 60 engage clutch sleeves 64 and 65 by which the gears 32-and 33 previously described may be alternately connected to ,the driving collars 300 and 310 for the cylinders and 31.

der 30 will be rotated when the parts are 1 in the position indicated in Fig. 3, while the cylinder 31 will be rotated with the parts in the position shown in 4.

The arms 60 and 60 are loosely pivoted on the hub of the lever 60 and vare held against stops 610 and611 on the lever 60 by a spring 612. interposed between portions of the armsGO and 60 of either clutch member 64 or 65' is ob structed, the corresponding arm will yield temporarily and breakage is thus avoided.

Having described the details of construction of my improved dobby, it will be evident that a dobby made in accordance with my present invention is under positive congear 43 by suitable patternv each cylinder, both sets of cylinder levers The parts are so designed that the cylin- If movement trol of the patternmechanism at all times and that disabling of the mechanism through failure in correct timing is effectively avoided.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is: i c

1. A double cylinder loom dobby comprising two pattern cylinders, a set of dobby levers, a separate set of cylinder'levers for cooperating with the single set of dobby levers, a rocking support for said levers, an actuating member, pattern-controlled means for moving said actuating member positively in both directions, and direct positive connections from said member to said rocking support, whereby positive movements of said support and cylinder levers in both directions to operative position are effected.

2. A double cylinder loom dobby compri ing two pattern cylinders, a set of dobby levers, a separate set of cylinder levers for each cylinder, both sets of cylinder levers cooperating with the single set of dobby levers, a rocking support for said levers, an actuating member, pattern-controlled means for moving said actuating member positively in both directions, and links positively connecting both ends of said actuating member to the corresponding ends of said rocking support, whereby positive movements of said support and cylinder levers'i'n both directions to operative position are effected.

In testimony whereof I have hereunto af- Ill 

